Thermal Wind Tunnel
Audi uses the thermal wind tunnel mainly to study the engine cooling system and the heat management. Vehicles are tested under extreme conditions in the tunnel, where temperatures can reach 55 degrees and air speeds can be pushed up to 275 km/h.
In contrast to the aeroacoustic wind tunnel, the air flow in the thermal wind tunnel follows a vertical path. A powerful one megawatt fan operates in the upper storey above the test section, with a heat exchanger immediately behind it which heats the air continuously from +20 to +55 °C.